Chemical apparatus and process disinfecting – deodorizing – preser – Control element responsive to a sensed operating condition
Patent
1994-06-14
1995-08-29
Alexander, Lyle A.
Chemical apparatus and process disinfecting, deodorizing, preser
Control element responsive to a sensed operating condition
422 99, 7386411, B09L 302
Patent
active
054457971
ABSTRACT:
A pipettor assembly includes a pipettor and a pipette tip. In one embodiment, the pipettor has a tubular body which defines a hollow central bore. The central bore is closed at a first end and open at a second end. A cutout penetrates a side wall of the body near the second end to expose the central bore. A resilient, flexible member sealably covers the cutout. The pipette tip is coupled to the second end of the pipettor. A liquid is drawn into the pipette tip by depressing and then releasing the flexible member. A liquid is expelled by depressing the flexible member. In another embodiment, the pipettor has an elongated body with an air passage between the second and a side portion of the body. A flexible membrane is sealably attached to the side portion of the body. A deflection of the flexible membrane will cause a change in the volume of the air passage for picking-up and expelling liquids from the pipette tip.
REFERENCES:
patent: 917442 (1969-04-01), Hutchinson
patent: 5125278 (1992-06-01), Foldenauer
Siemer, D. D., Appl. Spec. vol. 30:2 237-238.
Alexander Lyle A.
McGlashen Michael L.
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